|
- UID
- 235482
- 帖子
- 2
- 主题
- 1
- 注册时间
- 2011-10-23
- 最后登录
- 2012-6-17
|
求解sample exam, afternoon, Q20
Q20 The following ten observations are a sample drawn from a normal population: 25, 20, 18, -5, 35, 21, -11, 8, 20, and 9. The fourth quintile (80th percentile) of the sample is closest to:
A. 8.0.
B. 21.0.
C. 24.2. |
|
发表于 2011-11-20 11:27
| 